The logical content of the risk ratio

Abstract

Many different measures of association are used by medical literature, the relative risk is one of these measures. However, to judge whether results of studies are reliable, it is essential to use among other, measures
of association which are logically consistent. In this paper, we will present how to deal with one of the most
commonly used measures of association, the relative risk. As an example, data of view Covid-19 vaccine studies
2020/2021 are used. The conclusion is inescapable: the relative risk is logically inconsistent and should not be
used any longer.